JP2015098662A - Composite spun yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel composite spun yarn capable of imparting a glossy feeling with a high-class feeling, wearing comfort, anti-pilling properties, water-absorbing and quick-drying properties, and contact cold sensitivity as well as an appropriate strength to a woven or knitted fabric by utilizing the merits of triacetate-based staple fibers.SOLUTION: The composite spun yarn comprises triacetate-based staple fibers A having a single fiber fineness of 0.5-3.0 dtex and cellulosic staple fibers B. The mass ratio (A/B) of the staple fibers A and B is within the range of 20/80-80/20. Further, in the composite spun yarn, a fluff index of 3 mm or greater is 50/m or less and an average strength is 100 CN or greater.

Description

  The present invention makes use of the superior points of triacetate short fibers to give woven and knitted fabrics a high-grade glossiness, wearing comfort, anti-pilling properties, water-absorbing quick-drying properties, contact cooling sensation, and appropriate strength. It relates to a composite spun yarn that can be made.

  Woven knitted fabrics (cotton woven fabrics) made of cotton yarn have excellent wearing comfort such as tension and waist feeling, and are widely used in the clothing field. However, cotton knitted fabrics generally have high water retention, take time to dry after water absorption, and have a problem that a feeling of stickiness tends to remain when sweating. In addition, cotton knitted fabrics have a problem that they have poor contact cooling sensation and it is difficult to obtain a high-quality gloss. Furthermore, woven or knitted fabrics (rayon woven fabrics) made of rayon yarn such as modal or lyocell are also widely used in the clothing field. Rayon knitted fabrics are generally excellent in wearing comfort such as tension and waist and gloss, and have a high quality appearance. However, rayon knitted fabrics have a problem that they have poor anti-pilling properties and take time to dry after water absorption. In addition, there is a problem of lack of contact cooling.

  Then, in order to solve these problems in cotton knitted fabric and rayon knitted fabric, a method using polyester long fibers in combination has been proposed (for example, Patent Document 1).

JP-A-8-209476

  The invention described in the above-mentioned patent document relates to a twisted yarn composed of cotton yarn and polyester continuous fiber yarn. By using this twisted yarn, the drying time after water absorption is greatly increased while maintaining the wearing comfort of the woven or knitted fabric. Can be shortened. However, there is a problem that the anti-pilling property is reduced due to the high Young's modulus of the polyester long fiber yarn, and the glossiness is also reduced. In addition, the problem that the desired cold contact sensitivity cannot be obtained has not been solved.

  The present invention eliminates such disadvantages of the prior art, taking advantage of the superiority of triacetate short fibers, high-quality gloss on knitted and knitted fabrics, wearing comfort, anti-pilling properties, water-absorbing quick-drying Another object of the present invention is to provide a novel composite spun yarn capable of imparting moderate strength in addition to contact cooling sensitivity.

  As a result of intensive studies to solve the above problems, the present inventor reduces the fluff of the spun yarn by using a predetermined amount of triacetate-based short fibers and cellulose-based short fibers and increasing the accumulation degree of the fiber bundle. As a result, the present inventors have found that it is possible to overcome the disadvantages of triacetate short fibers that give excellent texture to woven and knitted fabrics and improve physical properties such as water-absorbing quick-drying property and contact cooling sensibility, and are also inferior in strength. It came to.

  That is, the present invention is a composite spun yarn of a triacetate short fiber A and a cellulose short fiber B having a single yarn fineness of 0.5 to 3.0 dtex, and the mass ratio (A / B) of the short fibers A and B Is a composite spun yarn characterized by having a fluff index of 3 / mm to 50 / m and an average tenacity of 100CN or more. To do.

  According to the present invention, by taking advantage of the superiority of triacetate short fibers, the woven or knitted fabric has a high-grade glossiness, wearing comfort, anti-pilling properties, water-absorbing quick-drying properties, contact cooling sensation, etc., as well as moderate strength. A new composite spun yarn can be provided.

  Hereinafter, the present invention will be described in detail.

  The composite spun yarn of the present invention has been devised in order to make use of the advantages of triacetate short fibers that are excellent in quick-drying and coolness, and at the same time to compensate for the disadvantage of being inferior in strength.

  As the triacetate-based short fibers A in the present invention, cellulose acetate short fibers in which 92% or more of the hydroxyl groups are acetated can be preferably used. Further, the official moisture content of the short fiber A is preferably about 3.5% from the viewpoint of quick drying. And about the cross-sectional shape and surface shape of the triacetate type | system | group short fiber A, it does not specifically limit. The single yarn fineness needs to be in the range of 0.5 to 3.0 dtex. When the single yarn fineness is less than 0.5 dtex, the spinnability is remarkably lowered. When the single yarn fineness is more than 3.0 dtex, sufficient wearing comfort cannot be given to the woven or knitted fabric.

  The cellulose short fibers B in the present invention are preferably natural fibers such as cotton and hemp, regenerated fibers such as viscose rayon and cupra made from cellulose, and solvent-spun cellulose fibers such as lyocell. Lyocell is particularly preferred. The cross-sectional shape, surface shape, length, single yarn fineness and the like of the short fiber B are not particularly limited, but it is preferable to select one suitable for cotton spinning in consideration of versatility and productivity.

  Furthermore, in the present invention, the short fibers A and B need to be mixed in a composite spun yarn at a mass ratio (A / B) of 20/80 to 80/20. When the mass ratio is out of this range, the characteristics derived from only one of the short fibers A and B are strongly reflected in the woven or knitted fabric, and only the characteristics lacking in balance can be obtained. Specifically, when the mass ratio of the triacetate-based short fibers A is less than 20% by mass, high-quality gloss, water-absorbing quick-drying property, and contact cooling sensation cannot be obtained. On the other hand, when it exceeds 80% by mass, the spinnability is lowered, and further, desired wearing comfort and appropriate strength cannot be obtained. The short fibers A and B may be mixed during the spinning process, for example, in the process of blended cotton or kneading.

  The composite spun yarn of the present invention needs to have a fluff index of 3 mm or more in a range of 50 pieces / m or less. It is possible to set the fluff index within this range by increasing the accumulation degree of the fiber bundle. And in order to raise the accumulation degree of a fiber bundle, it is good to introduce a compact spinning system at the time of spinning. The compact spinning system is a means to increase the uniformity of the fiber bundle achieved by the air suction type focusing mechanism, and the air suction type focusing mechanism is usually installed between the draft area and the twisting area. Is done. By introducing a compact spinning system, the spun yarn becomes dense with less fluff, and as a result, improvement in strength and elongation can be expected. The air suction type focusing mechanism includes a perforated apron system and a perforated drum system, and any system can be employed in the present invention.

Triacetate-based short fibers generally have the disadvantage of being inferior in strength, but in the present invention, the cellulose-based short fibers A are used together in a predetermined amount, and the fluff index is set to a predetermined range or less to compensate for such disadvantages. Specifically, the composite spun yarn of the present invention has an average tenacity of 100 CN or more. By securing such strength, it can be preferably applied to the clothing field.
Further, the spun yarn of the present invention may contain fibers other than the triacetate short fibers A and the cellulose short fibers B as long as the object of the present invention is not impaired. Any other fiber can be used. The spun yarn of the present invention preferably contains 60% by mass or more of polyester short fibers A and cellulose short fibers B in total.

The twist coefficient of the composite spun yarn is preferably in the range of 2.0 to 4.0. The twist coefficient is an equation of A = T / N ^1/2 (A: twist coefficient, T: number of twists (times / inch), N: thickness of the obtained composite spun yarn (English cotton count)). It is calculated.

  The spun yarn of the present invention may be used as a twin yarn, a triple yarn as necessary, or may be used as a fine spun twisted yarn.

  The composite spun yarn of the present invention can give excellent texture and physical properties to a woven or knitted fabric. Woven knitted fabric is a general term for woven fabric and knitted fabric. The design of the woven / knitted fabric, that is, the structure, density, basis weight, etc. is not particularly limited. The conditions for weaving and knitting are also arbitrary. Of course, the loom and knitting machine used for weaving and knitting are not particularly limited.

  When obtaining a woven or knitted fabric using the spun yarn of the present invention, it is preferable to mainly use the composite spun yarn, but other yarns may be used in combination as long as the object of the present invention is not impaired.

  The post-processing after weaving and knitting is not particularly limited, and the target woven or knitted fabric can be usually finished by scouring, relaxing, and final setting. During or after the series of post-processing, the fabric may be dyed, colored, embossed, water-repellent, antibacterial, phosphorescent, deodorized, and the like based on known knowledge. Generally, it is preferable to dye after relaxing.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in detail, this invention is not limited to these.

  Each measuring method and evaluation method are as follows.

(1) Texture of woven or knitted fabric The evaluation was made in three stages by handling.
○: Good, △: Slightly inferior, ×: Inferior

(2) Glossiness of woven or knitted fabric Judgment was made in three stages by visual observation.
○: Good, △: Slightly inferior, ×: Inferior

(3) Diffusive residual moisture content of woven or knitted fabric 0.6 g of distilled water was dropped in the center on a glass plate placed on a balance. And after putting a data so that a water | moisture content may contact | connect the back surface of the measurement data cut to 10 cm x 10 cm, the weight change was measured and the time until a residual moisture content reached to 10% was measured.

(4) Anti-pilling property of woven or knitted fabric Measured based on JIS L1076 ICI method. Two 100mm x 120mm test pieces are taken in the warp direction and the weft direction, wound around a rubber tube for pilling test, and four test pieces wound around the rubber tube are put into a rotating box of an ICI type testing machine. Rotated for 5 hours. Then, the test piece was removed from the rubber tube, and the test piece and the pilling determination standard photograph were compared to determine the grade of the occurrence of pilling.

(5) Contact cooling sensitivity of woven or knitted fabric (Qmax, W / cm ² )
The maximum heat absorption rate under the condition of DT = 20 ° C. was measured using a precise rapid thermophysical property measuring apparatus (“THERMO RABOII” manufactured by Kato Tech Co., Ltd.).

(6) Average strength of composite spun yarn Using a constant-speed extension type tensile tester, attach it to the grip of the tensile tester with the initial load applied to the sample at an extension rate of about 100% of the grip interval per minute. A test was performed, and the load (CN) when the sample was cut was measured. The average of 20 samples was defined as the average strength.

(7) Fluff index It measured based on JIS L1095 9.22.2B method. A parallel parallel light beam in one direction is applied to the sample, and an image of the fluff is copied onto a shielding plate placed on the opposite side of the light source when viewed from the sample. The number of fluffs of 3 mm or more that is projected corresponds to the fluff index. For measurement, an F-INDEX tester (manufactured by Shikibo Co., Ltd.) was used 30 times with a sample length of 10 m, and the average value was defined as the fluff index.

(8) Burst strength of woven or knitted fabric Measured based on JIS L1018 8.17.1A method (Murlen type method).

Example 1
Triacetate short fiber A (“Bright” manufactured by Mitsubishi Rayon Co., Ltd.) having a single yarn fineness of 1.7 dtex, an average fiber length of 38 mm, and an official moisture content of 3.5%, and a Supima A blended sliver was obtained by mixing ultra-long cotton with the blended cotton. In this blended sliver, the mass ratio of both fibers (short fiber A / ultra long cotton) was 50/50.
Next, a mixed spinning sliver is introduced into the roving machine to produce two roving yarns, and later, the two roving yarns are simultaneously introduced into a spinning machine equipped with a compact spinning system, and fine spinning and twisting are performed. A composite spun yarn of yarn was obtained.

Then, the obtained composite spun yarn was introduced into a circular knitting machine (manufactured by Fukuhara Seiki Seisakusho Co., Ltd.) having a needle density of 18G and a number of needles of 900, and a knitted fabric of a milling structure was knitted. Thereafter, the knitted fabric was sequentially scoured, relaxed, dyed, and finally set to obtain a knitted fabric having a basis weight of 122 g / m ² . The dyeing was performed by two-bath dyeing with a disperse dye and a reactive dye. Specifically, a disperse dye ("DianixBlack TA-N200" manufactured by Dystar Japan Co., Ltd.) was dyed at 130 ° C for 60 minutes using 12% omf, and then a reactive dye ("SUMIFIX SUPRA" manufactured by Sumitomo Chemical Co., Ltd.) was used. It dye | stained for 40 minutes at 60 degreeC using 5% omf.

  The obtained knitted fabric had a deep black color and an elegant gloss, and was excellent in anti-pilling property, water-absorbing quick-drying property, and contact cooling property. Moreover, it had a soft texture and a feeling of swelling, and was excellent in wearing comfort. Furthermore, since the knitted fabric has a certain burst strength value, it is recognized that it has an appropriate strength.

(Examples 2 and 3)
Except for changing the mass ratio of short fiber A and extra long cotton (short fiber A / extra long cotton) to 30/70 (Example 2) or 65/35 (Example 3), the same procedure as in Example 1 was performed. A composite spun yarn having a thickness of 100 count twin yarn was obtained. Thereafter, post-processing was performed in the same manner as in Example 1 to obtain a knitted fabric having a basis weight of 132 g / m ² (Example 2) or 122 g / m ² (Example 3).

  Each of the obtained knitted fabrics had a deep black color and an elegant gloss as in the knitted fabric of Example 1, and was excellent in anti-pilling property, water-absorbing quick drying property, and contact cooling sensation. Moreover, it had a soft texture and a feeling of swelling, and was excellent in wearing comfort. Furthermore, it had moderate strength.

Example 4
A composite spun yarn of 100 count double yarn was obtained in the same manner as in Example 2 except that lyocell short fibers having a single yarn fineness of 0.9 dtex and an average fiber length of 34 mm were used instead of Supima ultralong cotton. It was. Thereafter, post-processing was performed in the same manner as in Example 1 to obtain a knitted fabric with a basis weight of 103 g / m ² .
The obtained knitted fabric, like the knitted fabric in Example 2, had a deep black color and an elegant glossiness, and was excellent in anti-pilling property, water-absorbing quick drying property, and contact cooling property. Moreover, it had a soft texture and a feeling of swelling, and was excellent in wearing comfort. Furthermore, it had moderate strength.

(Comparative Examples 1 and 2)
Except for changing the mass ratio of short fiber A and extra long cotton (short fiber A / extra long cotton) to 10/90 (Comparative Example 1) or 90/10 (Comparative Example 2), the same procedure as in Example 1 was performed. A composite spun yarn having a thickness of 100 count twin yarn was obtained. Thereafter, post-processing was performed in the same manner as in Example 1 to obtain a knitted fabric having a basis weight of 135 g / m ² (Comparative Example 1) or 125 g / m ² (Comparative Example 2).
Although the knitted fabric according to Comparative Example 1 had excellent wearing comfort derived from Supima ultra-long cotton, the content of triacetate short fiber A was small, high-quality gloss, water-absorbing quick-drying, contact cooling Sensitivity was not obtained.

  On the other hand, the spun yarn according to Comparative Example 2 was poor in spinnability and had many neps and yarn spots. Further, it was inferior in strength to the yarn of Example 1. Moreover, although the knitted fabric was very excellent in the deep black color derived from the triacetate-based short fibers A and the elegant glossiness, it was somewhat inferior in wearing comfort derived from the super long cotton.

(Comparative Example 3)
The blended sliver was obtained by mixing the triacetate short fiber A in Example 1 and the polyester short fiber having a single yarn fineness of 1.3 dtex and an average fiber length of 38 mm in the course of blended cotton. In this blended sliver, the mass ratio of both fibers (short fiber A / polyester short fiber) was 60/40.

Next, a mixed spinning sliver is introduced into the roving machine to produce two roving yarns, two roving yarns are simultaneously introduced into the spinning machine, and spinning is carried out according to a conventional method to obtain a 40th composite spun yarn. It was. Thereafter, post-processing was performed in the same manner as in Example 1 to obtain a knitted fabric having a basis weight of 152 g / m ² .
The obtained knitted fabric had a deep black color derived from the triacetate short fiber A, but because the polyester short fiber was used in a certain amount or more, the anti-pilling property of the knitted fabric was reduced and the glossiness was changed. The result was reduced.

  The evaluation results of the knitted fabric obtained above are shown in Table 1.

Claims (1)

A composite spun yarn of triacetate short fibers A and cellulose short fibers B having a single yarn fineness of 0.5 to 3.0 dtex, and the mass ratio (A / B) of the short fibers A and B is 20/80 to 80 A composite spun yarn characterized by being in the range of / 20, further having a fluff index of 3 mm or more of 50 pieces / m or less, and an average strength of 100 CN or more.